Don't activate a window if screen is locked.

chrome/browser/chromeos/login/login_display_host.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_HOST_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_HOST_H_
 #pragma once
 
 #include <string>
 
@@ skipping 22 matching lines @@
 
   // Returns corresponding native window.
   virtual gfx::NativeWindow GetNativeWindow() const = 0;
 
   // Returns corresponding widget.
   virtual views::Widget* GetWidget() const = 0;
 
   // Called when browsing session starts so
   // LoginDisplayHost instance may delete itself.
   virtual void OnSessionStart() = 0;
+  virtual void PreSessionStart() = 0;
 
   // Toggles OOBE progress bar visibility, the bar is hidden by default.
   virtual void SetOobeProgressBarVisible(bool visible) = 0;
 
   // Enable/disable shutdown button.
   virtual void SetShutdownButtonEnabled(bool enable) = 0;
 
   // Toggles whether status area is enabled.
   virtual void SetStatusAreaEnabled(bool enable) = 0;
 
@@ skipping 15 matching lines @@
   // Starts sign in screen.
   virtual void StartSignInScreen() = 0;
 
   // Resumes a previously started sign in screen.
   virtual void ResumeSignInScreen() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_DISPLAY_HOST_H_